Caffeine Sensitivity and Sleep Latency: How Late Is Too Late Based on Your Metabolism Type

If caffeine makes you stare at the ceiling, the “right” cutoff time depends less on willpower and more on biology: your caffeine half-life (metabolism) and your brain’s sensitivity to stimulants.

Mouth Breathing During Sleep: How It Fragments Sleep (and Safe, Practical Ways to Reduce It)

Waking up with dry mouth, snoring, or feeling unrefreshed can be a sign you’re breathing through your mouth at night. Learn how mouth breathing can disrupt sleep—often through airway narrowing

Blue light after sunset: which devices disrupt melatonin the most (and what to change first)

Not all “screens before bed” are equally disruptive. The biggest melatonin hits usually come from bright, short-wavelength-heavy light close to your eyes (especially phones and tablets) plus overly bright room